Texas Instruments AM26LS32ACDG4

Overview

AM26LS32ACDG4 from Texas Instruments is a quadruple differential line receiver compliant with ANSI TIA/EIA-422-B, TIA/EIA-423-B, and ITU V.10/V.11 standards. It operates from a single 5-V supply, delivers ±7-V common-mode input range with ±200-mV sensitivity, features 3-state outputs and complementary enable inputs, and is used in industrial RS-422 bus interfaces for factory automation and motor drive systems.

For engineers reviewing the AM26LS32ACDG4 datasheet, AM26LS32ACDG4 pinout, AM26LS32ACDG4 application, or AM26LS32ACDG4 equivalent, this page provides verified technical context, real-world interface constraints, fail-safe behavior under open-input conditions, propagation delay (20–35 ns), and compatibility guidance for RS-422 receiver replacement in legacy industrial designs.

Technical Context

The AM26LS32ACDG4 implements four independent differential receivers with dual active-high/active-low enable logic (G and G̅), enabling flexible bus control in multi-drop configurations. Its fail-safe design forces high outputs when inputs are open, and input hysteresis (50 mV typical) suppresses noise-induced switching near threshold.

It uses low-power Schottky circuitry and supports TTL-compatible output levels (VOH ≥ 2.7 V, VOL ≤ 0.45 V at 8 mA). The device exhibits 12 kΩ minimum input impedance to minimize bus loading and meets absolute maximum ratings including ±25-V differential input voltage and 7-V supply voltage.

Key Specifications

Pinout & Package

AM26LS32ACDG4 is packaged in a 16-pin SOIC (D package), measuring 9.9 mm × 6.0 mm, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is marked by a beveled corner or dot; the package is rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential line receiver applications.

Compared with SN75173N and DS3695MX, AM26LS32ACDG4 uniquely combines fail-safe open-input behavior, 3-state outputs, and ±7-V common-mode tolerance in a commercial-temperature SOIC package-making it optimal for cost-sensitive, bus-oriented industrial control designs requiring inherent robustness.

Availability

AM26LS32ACDG4 is available at Aetrix Electronics and suitable for factory automation, AC motor drives, and smart grid metering requiring stable component supply across multi-year production cycles.

Supply support for AM26LS32ACDG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company founded in 1930, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The AM26LS32A family was designed specifically for robust RS-422/RS-423 receiver functions in electrically noisy industrial environments, emphasizing fail-safe operation, bus compatibility, and long-cable signal integrity.

FAQ

What is the maximum cable length supported by AM26LS32ACDG4 in RS-422 mode?

AM26LS32ACDG4 supports cable lengths up to 1000 m at lower data rates (e.g., 100 kbps), as confirmed in TI's official description. At higher speeds (e.g., 1 Mbps), practical length is limited by signal integrity and termination; typical deployment ranges from 10 m to 100 m depending on cable quality, noise, and data rate. The ±7-V common-mode range and 50-mV hysteresis directly enable reliable operation over these distances.

Does AM26LS32ACDG4 require external pull-up or pull-down resistors on its inputs?

No, AM26LS32ACDG4 does not require external biasing resistors on its differential inputs due to its built-in open-input fail-safe feature. When both A and B inputs are unconnected, internal circuitry ensures all Y outputs remain logic high-a key design advantage for hot-plug or modular systems. This behavior is explicitly documented in the Functional Description and confirmed in the Function Table (Table 8-1).

Can AM26LS32ACDG4 be used with 3.3-V microcontrollers?

AM26LS32ACDG4 is a 5-V-only device and must be powered from a 5-V supply; however, its outputs are TTL-compatible and can interface directly with 3.3-V microcontrollers that tolerate 5-V-tolerant inputs. Its inputs accept standard TTL voltage thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), so 3.3-V logic driving the G/G̅ enables is fully compatible. Do not connect AM26LS32ACDG4 outputs to non-5V-tolerant 3.3-V inputs without level translation.

What is the meaning of "DG4" in AM26LS32ACDG4?

The "DG4" suffix in AM26LS32ACDG4 denotes a specific packaging and marking variant: "D" = SOIC-16 package, "G4" = TI's green (lead-free, RoHS-compliant) assembly and test flow with NiPdAu lead finish and MSL Level-1 rating. This is confirmed in TI's Package Option Addendum, where AM26LS32ACDG4 is listed as an active, RoHS-compliant, tape-and-reel SOIC part with 2500-unit reels.

How does the dual-enable (G and G̅) functionality work in AM26LS32ACDG4?

In AM26LS32ACDG4, either G (active-high) or G̅ (active-low) can independently enable all four receivers-no simultaneous assertion is required. If G is driven high (≥2 V) while G̅ floats or is pulled low, receivers activate; similarly, pulling G̅ low (≤0.4 V) with G inactive achieves the same. This flexibility allows seamless integration with diverse control architectures, as detailed in Section 8.3 and the Function Table of the datasheet.